While testing out the new 1.04 5121 dedi server, I encountered a bug whereby 80% of the people on the server were forefully disconnected (Said "bob is losing connection" etc).

The few that did not get disconnected remained, but noticed no new players coming back.

After some investigation it was discovered that the server was no longer being listed on the ingame server browser, and I had to shut down the server and restart it to make it reappear.